any ideas ,it's so bad loose sight of cars in rear mirror! It happens after quite driving and then hard acceloration out of junction !

 

Check your Pollution Control Valve. If it's stuck open, the car will be sucking oil into the cylinders through the MAF tube. If this is it, you'll need to replace the PCV and clean the MAF sensor. Not really a tough job, and the symptoms are much more serious in appearance than the actual problem is.

 

Normally good advise, John.
However, the M112 engine does not have a PCV valve, the left valve cover just has a tiny hole where the large tube connects prior to the throttle body, and another even smaller hole ( along with the right valve cover ) for the smaller hoses that connects post throttle body.

I once got the bright idea of removing and capping off the large hose - BAD IDEA.
The engine made some really strange noises that had me thinking bad water pump, although it continued to run OK.

I'm thinking maybe the OP has a burnt valve or something. He should do the dollar bill test ( or pound note test ) : with the car idling, slowly lower the bill down over the exhaust, if it sucks into the exhaust tip, then probably a burnt / sticking valve.

 

pound notes went years ago...£5 note smallest now, inflation for you.....

 

Well, go figure. I had another car with exactly the same symptoms as described, and this was a very simple fix. Thanks for that bit of info.

 

O, and forgot to mention : could be valve guides or valve guide seals.

 

Just suppose that there was a oil catch can and it was full, what would happen and how long would the overflow last?
Hmmmmm.

 

What mileage is on the car?

 

Car has 92k on the clock and has oil catch tank fitted in large breather to try to cure the smoke fault to no avail

 

I'm a bit confused! so you can drive for 250 miles, all ok? then you get the smoke problem?

 

After app 250 miles smoke for 200 MTRs then clears and all good for another 200/250 miles and then smoke ! No misfires ,sweet as a nut. Simlar symptoms as if oil is over filled? I am a skilled motor engineer but im baffled!

 

Was the catch can installed after you had the problem or before?
If before was it installed correctly?
I thought a catch can could cause this if it was filled to the max and needed emptying. See post seven.

 

The oil catch can is installed between the 2 SMALL breather hoses and the fitting AFTER the throttle body.
The LARGE single host connects from the driver side valve cover to the fitting BEFORE the throttle body.

 

The catch can does NOT go on the BIG hose :

https://www.crossfireforum.org/forum...re-oil-catch-c

 

Oil catch tank fitted after problem started & is empty. The large breather had oil residue that is why the catch was fitted in that pipe. The small breather pipes are dusty dry!

 

Here's a thought : remove one or both of the valve covers ( the BIG ones, not the little vent ones ) - see if there is much gunk in there.
If this car has always had Mobil1, should be very clean, if not, then those very tiny holes in the vent covers where the small hoses connect could be plugged. They should NOT be 'dusty dry'.

My car at 52,000 miles : ( click the picture, then click 'enlarge' )

 

Have removed breather covers and cam covers , right hand breather solid with gunge/carbonised oil hav cleaned them and am going to refit tomorrow will post results in a few hundred miles .thanks for all help/suggestions

 

Any resolution to this issue? I've had it for some time and couldn't find anything. Same symptoms. After a few hours it just blows oil smoke out the back. Occasionally it will trigger a misfire code on a few cylinders. I just let it cool a bit an off I go like nothing happened. Occasionally it will do this after a number of shorter drives.


I have 153K on it, and am looking to get rid of the car, so I don't want to spend more money on this car after almost a $4k investment earlier this year just to get to work.


Thanks!

 

Do you have an oil catch can? It may need to be emptied if you do.
Have you overfilled with oil?
Look at the above post answer and see if that applies to you.

 

Fault with my car turned out to be cam box cover/breather area partially blocked with a carbon build up restricting the return flow of oil to the sump/oil pan so the breather was drawing oil into the throttle body/intake manifold , hence misfire and smoke cloud until oil in manifold cleared of oil.
Hope this is of some help , it took a back to basics approach!